冷泉水体甲烷气体浓度反演方法研究

doi:10.3976/j.issn.1002-4026.2019.03.002

山东科学 ›› 2019, Vol. 32 ›› Issue (3): 10-15.doi: 10.3976/j.issn.1002-4026.2019.03.002

冷泉水体甲烷气体浓度反演方法研究

徐娟，刘波，华志励*

齐鲁工业大学（山东省科学院），山东省科学院海洋仪器仪表研究所，山东省海洋监测仪器装备技术重点实验室，国家海洋监测设备工程技术研究中心，山东青岛 266100

收稿日期:2018-11-26 出版日期:2019-06-20 发布日期:2019-06-01
通信作者: 华志励，男，助理研究员，研究方向为海底冷泉调查研究。E-mail:hua_zhili@163.com E-mail:hua_zhili@163.com
作者简介:徐娟（1984—），女，硕士，助理研究员，研究方向为冷泉声学数据处理。E-mail:xj_sdioi@163.com
基金资助:
青岛市应用基础研究计划（17-1-1-97-jch）；国际科技合作项目(2014DFR60490)

Research on inversion method of methane concentration in cold seep water

XU Juan，LIU Bo，HUA Zhi-Li^*

Shandong Provincial Key Laboratory of Marine monitoring instrument equipment technology National Engineering and Technological Research Center of Marine Monitoring Equipment Institute of Oceanographic Instrmentation，Qilu University of Technology (Shandong Academy of Sciences)， Qingdao 266100，China

Received:2018-11-26 Online:2019-06-20 Published:2019-06-01

摘要/Abstract

摘要： 冷泉水体中的甲烷气体浓度异常不仅是海底天然气水合物赋存的重要标志，同时对于研究海洋环境以及全球气候变化具有重要的意义。在现有海底冷泉特征分析研究的基础上，建立了根据单波束测深数据定量获取冷泉水体中的甲烷气体浓度分布的反演方法，并以鄂霍次克海千岛盆地西北陆坡冷泉区为例，利用海试获取的12 kHz和20 kHz声学回波测深数据，对研究区域内冷泉水体中的溶解甲烷浓度进行了计算。通过与冷泉水体样本的色谱分析结果进行比对可见，该反演方法的计算结果与现场实测数据具有良好的一致性，并且由于在波束角和气泡共振效应方面的优势，12 kHz测深数据对应的反演结果与实测数据更为接近。同时，相关计算结果表明，该区域内水体中的溶解甲烷主要来自于冷泉释放的甲烷游离气。此外，现场观测结果表明，水合物稳定带底界以深区域内冷泉气泡表面的水合物结壳会显著延长气泡的上浮时间和距离。

关键词: 海底冷泉, 水声学, 单波束测深, 冷泉气泡, 甲烷

Abstract: The abnormal methane concentration in cold seep water is not only an important indicator of natural gas hydrate occurrence in the seabed, but also of great significance to the study of the marine environment and global climate change. Based on the analysis and study of the characteristics of the existing cold seeps, a inversion method for quantitatively obtaining methane concentration distribution in cold seep water based on single beam sounding data was established. Taking the cold seep area in the northwest slope of the Kurile Basin in the Okhotsk Sea as an example, the concentration of dissolved methane in cold seep water of the study area was calculated by using the 12 kHz and 20 kHz acoustic echo sounding data obtained from the sea trial. Compared with the chromatographic analysis results of the cold seep water samples, the calculation results of this inversion method were in good agreement with the field measured data. And due to the advantages of beam angle and bubble resonance effect, the inversion results corresponding to 12 kHz sounding data were closer to the measured data. At the same time, relevant calculation results showed that the dissolved methane in the water of the survey region mainly came from the free methane gas released from cold seeps. In addition, the field observation results showed that the hydrated crust on the surface of the cold seep bubble in hydrate stability zone could significantly prolong the floating time and distance of the bubbles.

Key words: cold seep, underwater acoustic, single beam sounding, cold seep bubbles, methane

中图分类号:

P714⁺.8

徐娟, 刘波, 华志励. 冷泉水体甲烷气体浓度反演方法研究[J]. 山东科学, 2019, 32(3): 10-15.

XU Juan, LIU Bo, HUA Zhi-Li. Research on inversion method of methane concentration in cold seep water[J]. Shandong Science, 2019, 32(3): 10-15.

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冷泉水体甲烷气体浓度反演方法研究

Research on inversion method of methane concentration in cold seep water

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